The smallest particles are not actually balls, but are wibbly wobbly. To measure something we need to interact with it, even if we interact with it using light. But because those particles are all wibbly wobbly, we can’t say for sure where they are exactly. And that unsure distance is Plancks length.
Disclaimer; I am not theoretical not a physicist, now eat your vegetables.
The smallest particles are not actually balls, but are wibbly wobbly. To measure something we need to interact with it, even if we interact with it using light. But because those particles are all wibbly wobbly, we can’t say for sure where they are exactly. And that unsure distance is Plancks length.
Disclaimer; I am not theoretical not a physicist, now eat your vegetables.